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Radial shaft seals, also known as lip seals, are used to seal rotary elements, such as a shaft or rotating bore. Common examples include strut seals, hydraulic pump seals, axle seals, power steering seals, and valve stem seals.
ISO 6194 Rotary-shaft lip-type seals incorporating elastomeric sealing elements ISO 6194-2:2009 Part 2: Vocabulary; ISO 6194-5 Identification of visual imperfections; ISO 6196 Micrographics - Vocabulary ISO 6196-1:1993 Part 1: General terms; ISO 6196-2:1993 Part 2: Image positions and methods of recording; ISO 6196-3:1997 Part 3: Film processing
Ferrofluid-based seals used in industrial and scientific applications are most often packaged in mechanical seal assemblies called rotary feed-throughs, which also contain a central shaft, ball bearings, and outer housing. The ball bearings provide two functions: maintaining the shaft's centering within the seal gap and supporting external loads.
Pusher seals employ a dynamic secondary sealing element (typically an O-ring) which moves axially with the seal ring. Bellows seals employ a static secondary seal (such as an O-ring, high temperature graphite packing, or elastomeric bellows and axial movement is accommodated by contraction or expansion of the bellows.
The shaft is the component that carries the medium through the rotary union into the drum or roll. In many cases the shaft will turn with the drum or roll. In some cases, like in larger flanged rotary unions, the shaft may be stationary while the housing rotates. The bearings and seal are typically assembled around the shaft.
Dynamic Sealing Technologies, Inc. (DSTI) is an American privately held company that designs, manufactures, and integrates fluid rotary union and swivel joint products. The company's rotary union products are used to transfer hydraulic oils, chemicals, water, air, and other various liquids and gasses from stationary inlets to rotating outlets.